High Def Forum
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SDE or Artifacts

Steve A
03-05-2005, 05:16 AM
I have been shopping for a RP HD TV. I do like the Sony Grand Wegas overall but have noticed something but am not sure what it is. When there is camera movement, especially during a live HD broadcast, it appears that there IS a texture or "screen" that momentarily looks like the image is seen through or projected onto gauze. As the image moves with ther camera movement, the "mesh" or "screen" stays stationary. I only noticed it at one dealer displaying HD broadcasts and it was apparent only on the Sony LCD RPs and not on DLP units. I was later told that these effects were artifacts and not the SDE. I could not see this effect at Best Buy watching their special HD satilite feed of HD Discovery theater and I could not see it watching DVDs. Could some one please help me explain what I saw? :confused:

03-05-2005, 06:13 AM
See figure 3.10 at the following link to determine if it is the SDE.


Steve A
03-05-2005, 07:15 AM
Thanks kdog04. It was and it wasn't like the photo link. It would appear briefly when the camera was moving during a HD broadcast. It didn't look like the SDE that I noticed with the early Sharp LCD front projectors in the late eighties. The fact that it was only apparent with mid tone backgrounds during camera movement leads me to think that what I saw were "artifacts."

03-05-2005, 10:41 AM
Another effect you could be seeing is what is commonly being referred to as "Silk Screen Effect." That is when your eyes focus on the actual screen of the television. Most LCD RPTV use a screen that is not quite like the old Lenticular Lenses you have on CRT RPTVs. That screen is kind of a fine "sandblasted texture", if you would please. That is probably what you are noticing and I see it too. Usually only on tans, whites, light color, and only when the camera pans or moves, and sometimes when the camera is still...

Steve A
03-05-2005, 10:50 AM
Beastslayer 1,
That makes sense because that is exactly what I saw and I saw it on mid tones and light backgorunds when the camera moved or panned. It is not characterisitc of DLP RP, then? Still, overall, I like the brightness of the LCD sysyem. Probably the way I will go. I do find the Hitachi LCD RP very attractive also but I have been reading that the screen is shiny and reflective and that it doesn't do well in a room with too much light. I may stick with the less attractive (but still nice looking) basic 50" Sony Grand Wega.

03-05-2005, 11:40 AM
Beastslayer 1,
It is not characterisitc of DLP RP, then? Still, overall, I like the brightness of the LCD sysyem.SDE and SSE are both inherent in LCD displays. The potential for SDE is there for DLP as well since it uses fixed pixels but due to the higher "fill factor" (i.e. the pixels have less space between them) it isn't a problem like it is for LCD displays.

Steve A
03-05-2005, 11:54 AM
Well, I'm waiting for a 24 month no interest promotion at either Best Buy or Circuit City. I know there will be another generation of DLPs coming soon with capapbility to display the upcoming HD DVD or BLU-Ray DVDs but the pricing of those player/recorders will be astronomical so that'll be for my second HD TV laterdown the road. I'm inclined to take advantage of the current price cuts.

03-05-2005, 08:45 PM
BluRay and HD-DVD will use the standard ATSC image formats we have now...

1080p60 displays are the ultimate for the ATSC system, but there won't be a 1080p60 image format. Only 1080p24, 1080i30, 720p60. All upconvert without data loss to 1080p60.